Roller



(Model.) 4 Sfieets-She'et 1.

G. Gfl BURK'HARDT. ROLLER MILL POR (urRIlDIlVGq.GRAIIL` No. 251,826. Patents@ Jam-3,1882;

N, PETERS, Phuwumngphur. washing, n. c.

Y 4 sheds-sheets.

` Patented Jan. 3, 1882.

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(Model.)-

N PETERS, PnoroLithognphur, wnsmngmn. D. C.

(Model.) 4 Sheets- Sheet 31 G.G.LBURKHARDT. l ROLLERl MILL PoR .GRINDING GRAIN.

'N0. 251,826. Patenteduam 13,1882..

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` and Fig.` l1 is a side view of same.

` UNITED f STATES PATENT OFFICE.

CHARLES G. BURKHARDT, `OF BUFFALO, NEW YORK.

ROLLER-MILL FOR GRINDlNG GRAIN.

SPECIFICATION forming part of Letters Patent No. 251,826, dated January' 3, 1882.

Application filed January 17, 1881. (Model.)

To all whom it may/concern:

`Be it known that I, CHARLES G. BURK- HARDT, of the city ofv Buft'al0,'in the county of Erie, State of New York, have invented a new and useful Improvement in Roller-Mills for Grinding Grain, of which the following is a full,clear, and exact description, reference being had to the accompanyingdrawings, making part of this specification.

My improvement applies to that class of mills in which the material-grain, &c.-is ground between rollers. In my improved mill the grain has positive feed to the rolls, and after passing between `them falls on a reciprocating sieve, which separates the ,ner' from the eoarser material, each going to a separate conveyer for removal from the apparatus.

In the drawings, Figure l is an end eleva#` tion of the apparatus. Fig.2 is a side elevation of adjustable boxes, and Fig. 3 is a vertical transverse section of same, Fig. 4 is a vertical section of upper box, and Fig. 5 is a horizontal transverse section of same. Fig. 6 is a vertical section of lower box, and Fig. 7 is a horizontal section of same. Fig. 8 is avertical transverse section through the apparatus. Fig. 9`is an enlarged section of one side of the feed-hopper. Fig. l0 is a top view of shaker, Fig. 12is an endtvew 0f the brush-stick, showing the adjusting device. Fig. 13 .is a detail view, of one end of thebrush-stick, showingthe adjusting device. Fig. 1l Vshows the apparatus onehalf in side view and one-halt' in vertical section, the end portions of two rolls being shown inside view. Fig. l5 is -an end view ofthe apparatus, showin gthe driving mechanism. Fig.

16 is a detail transverse section of part of the grinding-surface of the roll, showingthe back of the `teeth curved in the arcof acircle; and Fig. ll is a similar section, showing the back of theteeth curved in the arc of an ellipse, the cutting-edge of the tooth beingat the point Y in the ellipse where the conjugate diameter of said supposed ellipse would touch its periphery. Fig. 18 is an enlarged view of one of the sievesupporting rollers.

A A are duplicate feed hoppers, each provided at the bottom with a feed roller, B, whereby the grain is removed from the hopper and fed to the grinding mechanism in a wellknown manner.

screw c in one or the other direction the slide Y Gis raised or lowered and the feed accordingly `increased 'or reduced. B is another slide arranged in the bottom opening of each feedhopper A, on the upper side of the outer wall thereof.

D is a yoke attached to the under side of the slide D, and extending through a slot in the outer wall of the hopper. j

E is an eccentric mounted upon a horizontal shaft, F, and engaging in the yohe D'.

F'-s anarm mounted upon one endof the shaft F, the two arms F' being arrangedupon the same side of the machine and connected by a bar, G,whereby both arms and eccentrics are actuated, and both slides D raised or lowered simultaneously.

lf desired, cog-segments and gear-racks may be substituted for the eceentrics E and yokes D.

The slides D limit the maximum amount ot material which can escape from the feed-hoppers, and also serve to shut off the feed entirely, when required, and the slides C are each adjusted separately to regulate the feed from each hopper independent of the other.

I-Il represents an inclined board or plate upon which the grain falls from each hopper, and whereby7 it is conducted between the grindingrolls I l.,which are arranged in two pairs, side by side, in the fra-me of the machine, therolls constitutingone pair being arranged one above the other. The roll I of eachpair runs at a greater peripheral speed than the roll I', the contiguous surfaces of the rolls moving in the same direction when the rolls are used for reducing grain; but they may rotate in opposite directions when the rolls are employed forshellingorhullinggrain. rlhe rolls l I have theircylindrical surta-ces provided with spiral ribs t', laid in the same direction on both rolls, so that the contiguous ribs will cross each other and have a shearing action on the material. The ribs are composed of a flat abrupt side, fi', and a curved side,i2, of less inclination, The abrupt IOO I sideis laid parallel with aradialliue,1l3 i3, drawn through the middle of the rib, and the curved side is formed by the arc of a circle of ellipse, the center of the circle lying in the line i4 i5, which is a continuation of the abrupt side 'i' of the rib, whereby the edge of thetooth is made approximately rectangular. This form of the ribs t' is clearly shown in Figs. 16 and 17, and the direction in which the rolls rotate is illustrated in the same figures by arrows, the roll having the greater speed being indicated by two arrows. The ribs in the two rolls are re versed-that is, the flat side isthe advance side in the fast roll and the reverse side in the slow roll-when therolls are used for grinding, as shown in Fig. 16, but when the rolls are used for hulling the curved sides are the advance sides in both rolls, as shown in Fig. 17. From six to thirty-two ribs `to a circumferential inch are cut into the rolls, according-to the kind of work for which the rolls are used.

4J represents two or more inclined sieves, upon which the ground material drops from the rolls I I', and whereby the finer parts are separated from the coarser parts, the latter passing over the tail ends'of the sieves into a trough in which a conveyer, P, `is arranged, and the finer parts, which are sifted through, falling into a hopper, N, which is provided at its bottom lwith a conveyer, 0. The sieves J have a shaking motion transversely to their inclination, whereby an effective separation of the liner from the coarser particles is effected and the clogging up ot' the meshes of the screensis prevented. The sieves J are actuated by eccentrics l, mounted on a shaft, L, and the ends of the sieves impinge against adjustable springs M, whereby a greater or less jarring action can be given tothe sieves. The latter are supported on rollersj by means of angle-piecesj', attached to the under sides of the sieveframes. The rollersj turn in supports secured to cross-piecesj2, which are attached to the frame of the machine. By this means a rectilinear motion is imparted to the sieves at right angles to their inclination. The rollers j are preferably constructed with convex peripheries to allow the inclination ofthe sieves-to be changed without impairing the bearing of the rollers upon the cross-bars j'.

If desired, the number of sieves maybe iucreased to divide the ground material into grades of different ineness, and in this case a separate conveyer or dischargespout` may be provided for each grade.

.Qrepresents brushes arranged underneath the lower rolls to detach the meal which may ad here to them. The brushes Q extend through slots n at both ends of the machine and rest with their ends upon set-screws Q', whereby' they are adjusted toward and from the rolls.

l2 represents the shaft of the lower roll7 and R the cylindrical journal-boxes in which this shaft turns.' The boxes R turn`in'pillowblocks S,which slide vertically between parallel guides T, formed with the frame of themachine. The journal-boxes R are constructed at one or both ends with an eccentric ange, R',which rests upon'a bearing, N', between the lower ends of the guides T. The flange It' is provided with pin-holes r',for the insertion of a rod,wherehy thejournal-boxes R can he turned in the blocks S. By turning thejourual-boxes in the blocks S the eccentric periphery of the iianges It' bears against the bearing or support N' and raises or lowers the block S between the guides T, whereby a rectilinear vertical adjustment is given to the block S and the journal-box R supported therein. The eccentric danges R' are provided with set-screws rwhich bear against the outer side of the pillow-blocks S, and whereby thejournal-boxes centrics V, pivoted between llgs s, formed on the upper side ot' the/lower blocks, S. By turning the eccentrics V the upper rolls are raised or lowered with reference to the lower rolls. e arearms secured to the inner ends of the shafts of the eccentrics Von the inner sides ofthe side frames of the machine, ,and W is a rod, which connects the two arms c on the same side of the machine. ed by a cross-bar, X, whereby both rods and thefoureccentrics are actuatedsimultaneously. The upper rolls are retained in position after being'adjusted by a set-screw bearing against each ofthe arms c, as shown iu dotted lines in Fig. 1.

Y is a spring, which bears upon the upper block, S', and which is preferably arranged to surround the cylindrical oil-cup Y', which forms part of this block. The tension of the spring Y is regulated by a screw, Z, which works in a threadedhousing, Z', and bears upon a dislror follower fitted upon the upper end of the spring Y. These springs permit the upper rolls to rise when a hard substance passes between the rolls, thereby preventinginj ury to thedress.

In order to allow'eithcr end of the upper rol-l to rise independent of the other end, the upper journalboxes, U, are provided with spherical bearings in the blocks S', as clearly shown in Figs. 3 and5. As shown in Fig. 6, the lower pillow-block, S, is composed of two side pieces, S3, andan upper connecting-piece, S4, to the lower side ot' which the side pieces are secured by vertical bolts S5. The connecting-piece S4 is constructed on its upper side with-a depres- The rods W are connect- IOS tightenerpulley, and havinga smaller diameter than the pulley d. The pulley d' is connected by abelt,f, with a pulley, f", secured to the shaft I3 of the upper slow roll I'. The shaft of this roll carries on the other side of the machine a pulley, h, which is connected by a belt, 7c, with a pulley, m, upon the shaft of the lower slow roll I', as represented by dotted lines in Fig. 15. The pulleys b' ande upon the shafts of the two fast rolls I I are of equal diameter, to cause these rolls to. rotate at equal speed,and the pulleys IL and m upon the shafts of the slow rolls I' l are also equal in diameter.

The shafts of the feed-rolls B carry spurwheels B', which mesh together and are driven by a pinion, o, mounted upon a shaft, p. The latter carries a pulley, q, connected bya belt with a pulley upon either of the shafts I3. As the latter revolve in opposite directions the pinion would rotate in an improper direction if the driving-belt were changed from one shaft 13 to thc other. To prevent this the pinionsbaft p is supported in a hanger, r, which is pivoted at t, and which can be adjusted by a. set-screw, t', passing through a curved slot, r2, in the hanger, in such 4manner that the pinion o can be engaged with either of the gear-.wheels B'. By this means the latter can be rotated in the proper direction from either shaft I3.

Although no special claim is made to various parts of the machine shown, described, and not claimed, their illustration and description are considered necessary to a proper understanding of the machine and its mode of operation.`

l do not desire to claim theadjustable bracket on which the pinion is supported,`which operates the feed-rollers, this being` shown and described for the purpose of illustrating the feed mechanism more fully.

I claim as my invention- 1. The combination, with the feed-slides D,

Y shafts F, and a rod, G, .whereby the arms F' are connected, substantially as set forth.

2. The combination, with the pillow-block S and guideways T, of a journal-box, R, capable ot' turning in the block S, and provided with an eccentric iiange, It', bearing against a support, N', substantially asset forth.

3. The combina-tion, with the rolls I I', of the pillow-blocks S S', rectilinear guideways T, and the eccentrics V, interposed between the blocks S S' for adjusting the distance between the rollers, substantially as set forth.4

4. The combination, with the rolls I I', of the pillow-block S S', having lugs s, guideways T, and eccentrics V, pivoted between the lugs s, substantially as set forth. 5. The combination, with the rollsI ll',oftlie blocks S S', gnideways T, eccentrics V, provided with arms c, rods W, connecting arms c, and cross-bar X, substantially as set forth. 6. The combination, with the rolls I I', ofthe pillow-blocks S S', guideways T, eccentrics V, interposed between the blocks S S', and

adjustable spring Z, bearing upon the upper block, S', substantially as set forth.

7. The combination, with thejournal-box It, of the pillow-block S, composed of two side portions, S3, and connecting-piece S4, to which the side portions are secured, substantially as set forth.

CHARLES Gr. B URKIIARDT.V

Witnesses:

SAML. KNIGHT, GEO. H. KNIGHT. 

